Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd882a3ef5bed1c…

MALICIOUS

PDF

72.7 KB Created: 2021-09-16 07:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 729215bded4dc479c3303af0c01b162c SHA-1: 20bfbf8a082798cadc88ff0dbbe81255f91785fc SHA-256: ecd882a3ef5bed1c96b6511f70c86006713b9aac1a9463e0e403d6f1ae270e83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links and the nature of the hosting used strongly support a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://rotarybrescello.it/userfiles/files/vizusit.pdf In PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/19394933851.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/21603763554.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210913_77C5086FBBC8C413.pdfIn PDF document text
    • https://foulardfotografando.it/file/83784019482.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/40364513962.pdfIn PDF document text
    • https://geniodelweb.com/file/20899775574.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/wewarub.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/dugokevadubafadasuwomina.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/xivelerukogijelurit.pdfIn PDF document text
    • http://ebus.cn/up_file/file/13441879901.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db77a7371b---68878648203.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/zovoxosanuwigutumuvamux.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6fe31bf9aa49a73a0e00cc5af6d45684/zewenazomonivemegebuved.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/21939680255.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161409b50e91ed---29907787107.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d699346c7---7681335357.pdfIn PDF document text
    • https://zzhqhi.com/d/files/bivujuzeripenedibo.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/bavumizefifajazolobupada.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/5871703460.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/jidikuvejovukadi.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/sakigodug.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/dosepadiv.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/nagexufebisawepu.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/60694305855.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/xexubefitepekudamajonani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+unlock+any+app+lockPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB62 10260 bytes
SHA-256: 0ef9b997cef914661f4fc91fe4aedec8529dbbf4ddf222b41b49aef925ca532b
font_01_sfnt_off0000d2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A7 16556 bytes
SHA-256: 91d811fbbf8981726a8084a55e34251d2e9558dc1d58df7145c86d882b7cadb5
font_02_sfnt_off0000fca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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